Characterization and structure evolution of Ca-Al-CO 3 hydrotalcite film for high temperature CO 2 adsorption

Chih Hsiang Wu*, Yen Po Chang, San-Yuan Chen, Dean-Mo LIu, Ching Tsung Yu, Ben Li Pen

*Corresponding author for this work

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

In this work, monodispersed layered double hydroxide (Ca-AI LDHs) nanoparticles were synthesized by hydrothermal coprecipitation. Uniform thin films of layered double hydroxide on porous anodic aluminum oxide (AAO) substrates were formed by a direct precipitation process in a homogeneous suspension containing monodispersed Ca-AI layered double hydroxide nanoparticles. It was found that the formation of a designed hydrotalcite-like phase is strongly dependent on the [Ca 2+] [Al 3+] ratios, and that a minor CaCO 3 phase could possibly form simultaneously, which is attributed to the greater insolubility of CaCO 3 and the incompatibility of the ionic size of AI and Ca. The optimal CO 2 adsorption capacity appears in the layered Ca-OH-AI structure with the composition ratio of 3:1. Furthermore, the CO 2 adsorption mechanism varies with treatment temperature. Below 400 °C, the CO 2 adsorption is attributed to the LDH structure with a large surface area and pore volume, but above that the adsorption is due to the formation of CaCO 3 and CaO. The permeation behavior and CO 2 absorption can be explained by a preferable chemical and physical absorption of CO 2 on the layered double hydroxide and porous structure of the membrane.

Original languageEnglish
Pages (from-to)4716-4720
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume10
Issue number7
DOIs
StatePublished - 1 Jul 2010

Keywords

  • Anodic Aluminum Oxide
  • CO Absorption
  • Layered Double Hydroxide
  • Membrane
  • Nanoparticle

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